EXSS 380 Final Exam Questions with
Rationales 2026/2027 Update.
The smallest component of the nervous system that contributes to muscle contraction is the
__________.
A. motor end plate
B. motor unit
C. muscle twitch
D. sarcomere - Answer B. motor unit
Which type of muscle fiber is activated last during muscle contraction?
A. Type I
B. Type IIa
C. Type IIb
D. Type Ia - Answer C. Type IIb
The number of muscle fibers innervated by a single motor neuron is identified by the
_____________.
A. Henneman principle
B. Innervation constant
C. Innervation ratio
D. Motor ratio - Answer C. Innervation ratio
The interval following generation of the action potential when a neuron can be depolarized only
by an extraordinarily large EPSP refers to _____.
A. the repolarization period
B. the overshoot
C. the absolute refractory period
D. the relative refractory period - Answer D. The relative refractory period
Which type of neuron conducts nerve impulses toward the central nervous system?
A. Afferent
B. Association
C. Efferent
D. Interneuron - Answer A. Afferent
,The concentration gradient force has a tendency to _____.
A. move K+ out of the cell
B. move Cl- out of the cell
C. move K+ into the cell
D. move Na+ out of the cell - Answer A. move K+ out of the cell
The _____ is/are responsible for increased nerve conduction velocity.
A. Axon
B. Myelin sheath
C. Dendrite
D. Nodes of Ranvier - Answer A. myelin sheath
Input to the soma is achieved via the _____, while output is achieved via the _____.
A. Dendrite; axon
B. Axon dendrite
C. Synaptic end bulb; motor end plate
D. Axon hillock; synaptic vesicle - Answer A. Dendrite; axon
The neurotransmitter associated with skeletal muscle depolarization is _____.
A. GABA
B. Dopamine
C. Acetylcholine
D. Serotonin - Answer C. Acetylcholine
The majority of neurons are _____.
A. Efferent neurons
B. Afferent neurons
C. Association neurons
D. Spinal neurons - Answer C. Association neurons
A bundle of nerve fibers in the central nervous system is referred to as a _____.
A. Ganglion
B. Nucleus
C. Tract
, D. Nerve - Answer C. Tract
In general, a change in selective membrane permeability to _____ begins the chain reaction
that results in membrane depolarization.
A. K+
B. A-
C. Cl-
D. Na+ - Answer D. Na+
The cerebellum has connections to all of the following except _____.
A. The primary motor cortex
B. Brain stem nuclei
C. a-motorneurons
D. The premotor area - Answer C. a-motorneurons
The dorsal roots of spinal nerves contain ____.
A. Motorneurons
B. Interneurons
C. Efferent neurons
D. Sensory neurons - Answer D. sensory neurons
More than half of the neurons in the brain are located in the _____.
A. Primary motor cortex
B. Brain stem
C. Somatosensory cortex
D. Cerebellum - Answer D. Cerebellum
The spinal stretch reflex is an example of a(an) ________ feedback loop.
A. Positive
B. Negative
C. Neutral
D. Inhibitory - Answer B. negative
Neurons A and B are both Type Ia. Neuron A has an axonal diameter of 25 microns, and neuron
B has an axonal diameter of 18 microns. Which neuron has the highest conduction velocity?
Rationales 2026/2027 Update.
The smallest component of the nervous system that contributes to muscle contraction is the
__________.
A. motor end plate
B. motor unit
C. muscle twitch
D. sarcomere - Answer B. motor unit
Which type of muscle fiber is activated last during muscle contraction?
A. Type I
B. Type IIa
C. Type IIb
D. Type Ia - Answer C. Type IIb
The number of muscle fibers innervated by a single motor neuron is identified by the
_____________.
A. Henneman principle
B. Innervation constant
C. Innervation ratio
D. Motor ratio - Answer C. Innervation ratio
The interval following generation of the action potential when a neuron can be depolarized only
by an extraordinarily large EPSP refers to _____.
A. the repolarization period
B. the overshoot
C. the absolute refractory period
D. the relative refractory period - Answer D. The relative refractory period
Which type of neuron conducts nerve impulses toward the central nervous system?
A. Afferent
B. Association
C. Efferent
D. Interneuron - Answer A. Afferent
,The concentration gradient force has a tendency to _____.
A. move K+ out of the cell
B. move Cl- out of the cell
C. move K+ into the cell
D. move Na+ out of the cell - Answer A. move K+ out of the cell
The _____ is/are responsible for increased nerve conduction velocity.
A. Axon
B. Myelin sheath
C. Dendrite
D. Nodes of Ranvier - Answer A. myelin sheath
Input to the soma is achieved via the _____, while output is achieved via the _____.
A. Dendrite; axon
B. Axon dendrite
C. Synaptic end bulb; motor end plate
D. Axon hillock; synaptic vesicle - Answer A. Dendrite; axon
The neurotransmitter associated with skeletal muscle depolarization is _____.
A. GABA
B. Dopamine
C. Acetylcholine
D. Serotonin - Answer C. Acetylcholine
The majority of neurons are _____.
A. Efferent neurons
B. Afferent neurons
C. Association neurons
D. Spinal neurons - Answer C. Association neurons
A bundle of nerve fibers in the central nervous system is referred to as a _____.
A. Ganglion
B. Nucleus
C. Tract
, D. Nerve - Answer C. Tract
In general, a change in selective membrane permeability to _____ begins the chain reaction
that results in membrane depolarization.
A. K+
B. A-
C. Cl-
D. Na+ - Answer D. Na+
The cerebellum has connections to all of the following except _____.
A. The primary motor cortex
B. Brain stem nuclei
C. a-motorneurons
D. The premotor area - Answer C. a-motorneurons
The dorsal roots of spinal nerves contain ____.
A. Motorneurons
B. Interneurons
C. Efferent neurons
D. Sensory neurons - Answer D. sensory neurons
More than half of the neurons in the brain are located in the _____.
A. Primary motor cortex
B. Brain stem
C. Somatosensory cortex
D. Cerebellum - Answer D. Cerebellum
The spinal stretch reflex is an example of a(an) ________ feedback loop.
A. Positive
B. Negative
C. Neutral
D. Inhibitory - Answer B. negative
Neurons A and B are both Type Ia. Neuron A has an axonal diameter of 25 microns, and neuron
B has an axonal diameter of 18 microns. Which neuron has the highest conduction velocity?
